Method and apparatus for forming piles



May 3, 1932. M. M'. UPsoN METHOD AND APPARATUS FOR FORMING PILES FiledMay 28,V 1931 BY ATTORNEYS Patented May 3, 1932 i'il'. STATES PATENTFFE@ MAXWELL M. UPSON, OF ENGLEWOOD, NEW JERSEY, ASSIGNOR T RAYMONDCONCRETE PILE COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEYMETHOD AND APPARATUS FOR FORMING PILES Application filed May 28, 1931.Serial No. 540,681.

It has been proposed to form a concrete pile by a method having thefollowing steps: (1) Sinking into the ground a temporary casing; (2)placing in that casing a permanent casing; filling the permanent casingwith concrete; (4) withdrawing the temporary casing; (5) pouring groutbetween the casings into the annular space vacated by the temporarycasing while the temporary casing is being withdrawn.

In practice, it has been found impractical under'certain conditions tocarry out step (5) of the above described method because the grout has atendency to arch in the spacing between the casings.

The object of the present invention is to disclose a method of forcingthe grout under pressure directly into the space being vacated by thetemporary casing, while the tempera-ry casing is being removed.

In the drawings:

Fig. 1 shows the method after steps (1) and (2) have been performed and(3) is in progress.

Fig. shows the method during progress of step (5 Fig. 3 shows thecompleted pile.

Fig. 4 is an enlarged view of the lower end of Fig. 2.

Fig. 5 is a cross-section on line 5--5 of Fig. 1.

Numeral 10 designates the temporary casing, usually of substantial plaintubing, which has been sunk to position by any desired method, and thecontents removed therefrom. A passage is formed, preferably by welding apipe 12 thereto, lengthwise of casing 10 on the outside thereof. Untilstep (5) i begins, the lower end of pipe 12 is closed by a snuglyfitting plug 14 which serves to exclude dirt from entering the pipeduring the sinking of casing 10.

rIhe permanent casing 16 is usually of thin metal and thereforeinexpensive, and may be corrugated, as shown.

In the present invention steps (4) and (5) are carried onsimultaneously. As soon as the removal of casing 10 is begun, grout,under comparatively high pressure, is supplied through pipe or passage12. This pressure is sufficient to first blow plug 14 from pipe 12 andto then keep filled with grout 18 the space being vacated by pipe 10 andpipe 12 as they are withdrawn.

The completed pile structure, as shown in Fig 3 'comprises shell 16,filled internally with concrete 2O andl surrounded externally with thegrout shell 18.

It is to be understood that the invention isV not limited to thespecific embodiment'herein illustrated and described, butmay be used inother ways without departure from its spirit as defined by the followingclaims.

I claim:

1. A method of forming a pile in which two casings are employed onewithin the other, which includes filling the inner casing with concreteand delivering grout under pressure directly to the space being vacatedby the outer casing, while withdrawing said outer casing from aroundsaid inner casing.

2. The method of forming a pile by employing two casings one within theother, which includes filling the inner casing with concrete,withdrawing the outer casing while directly filling with grout underhigh pressure the space being vacated by said outer casing, said groutthus occupying a position surrounding said inner casing and forming adistinct layer separate from the concrete within said casing.

3. The method of forming a pile by employing two casings one closelyfitted within the other, which includes filling the inner casing withconcrete, withdrawing the outer Casing while directly delivering groutexteriorly of said outer casing into the space being vacated thereby.

4. The method of forming a pile by employing two casing one closelyfitted within the other, which includes filling the inner casing withconcrete, withdrawing the outer casing and forcing grout under pressurealong the exterior of said casing into the space being vacated thereby.

5. In apparatus for forming a concrete pile, a casing adaptedv to beinserted into the ground and subsequently removed, in combination withmeans for directly forcing grout into the space being vacated by saidcasing during the removal thereof.

6. In apparatus for forming a concrete pile,

a casing adapted to be inserted into the ground and subsequentlyremoved, in combination With a passage on said casing through whichpassage grout may be forced directly into the space being vacated bysaid casing during'the removal thereof.

7. Apparatus for forming a concrete jpile comprising a'casing adapted tobe driven intoV the ground and subsequently removed, in combination Witha'pipe secured eXteriorly to said casing through which pipe grout may beforced directly into the space being vacated by said casing during theremoval thereof.

V,8. Apparatus for forming a concrete pile comprisinga casing adapted tobe driven into the ground and subsequently removed and a pipe securedexternally to the casing and eX- tending substantially to the lower endthereof for delivering grout under pressure directly to the space beingvacated by said cas- 20 ingy through the'removal thereof. Y

In testimony whereof I hereto afIiX my signature.

' ,'MAXWELL M. UPS'ON.V

